逼近思想是一种基本且重要的数学思想方法。伴随逼近思想而产生的数学解题方法称为逼近法。近几年,在高考物理或竞赛中经常遇到用逼近法求解物理问题,这类题综合性强、方法独到,常使分析问题能力较弱的同学望而却步。但与常规方法比较,逼近法显得思路更清晰,思维更深刻,条理更清楚,思路更巧妙,过程更简捷,而且还可以启迪智慧,培养同学们敏 Approaching ideas is a basic and important mathematical thinking method. Mathematic approach to solving the problem with approximation is called approximation. In recent years, physics or competition in the college entrance examination often encounter the use of approximation method to solve physical problems, these questions comprehensive, unique, often weak students ability to analyze the problem deterred. However, compared with the conventional method, the approximation method appears clearer, more profound thinking, clearer, more clever ideas, the process more simple, but also can enlighten the wisdom and foster students sensitivity